A record player is spinning at 33.3 rpm. (a) How far does it turn in 2-sec? (b) When the motor is shut off, the record player spins down for 20-sec before coming to rest. What is the angular acceleration assuming that it is constant? How many turn does it make during this coast down?
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- A wheel with a radius of 0.4 meters initially at rest and begins to accelerate at 4 rad/s2. How many revolutions will the wheel travel in 4 seconds?Human centrifuges are used to train military pilots and astronauts in preparation for high-g maneuvers. A trained, fit person wearing a g-suit can withstand accelerations up to about 9g (88.2 m/s2) without losing consciousness. (A) If a human centrifuge has a radius of 4.29 m, what angular speed (in rad/s) results in a centripetal acceleration of 9g? rad/s ? (B) What linear speed (in m/s) would a person in the centrifuge have at this acceleration? m/sA flywheel slows from 517.7 rev/min down to 364.9 rev/min while spinning through 44.4 revolutions. What is the angular acceleration of the flywheel (in rad/s/s)? Assume that the flywheel slows down at a constant rate.
- A bicycle wheel is rotating at 40 rpm when the cyclist begins to pedal harder, giving the wheel a constant angular acceleration of 0.50 rad/s^2 What is the wheel's angular velocity, in rpm, 8.0 s later?A child sits on a merry-go-round that has a diameter of 4.00 m. The child uses her legs to push the merry-go-round, making it go from rest to an angular speed of 17.0 rpm in a time of 43.0 s. What is the average angular acceleration aavg of the merry-go-round in units of radians per second squared (rad/s?)? davg = rad/s2 What is the angular displacement Að of the merry-go-round, in units of radians (rad), during the time the child pushes the merry-go-round? A0 = rad about us careers privacy policy terms of use contact us help tv MacBook Air II F8 F10 D00 000 CA F9 F7The tires of a car make 85.0. revolutions as the car reduces its speed uniformly from 90.0 km/hr to 60.0 km/hr. The tires have a diameter of 0.90 m. What is the angular acceleration? If the car continues to slow down at this rate, how much more time is required to stop?
- A truck with 0.350 m radius tires travels at 35.5 m/s. At how many radians per second are the tires rotating? rad/sWhat is this value in rpm?A merry-go-round rotates from rest with an angular acceleration of 1.36 rad/s2. How long does it take to rotate through (a) the first 1.74 rev and (b) the next 1.74 rev?A Google search revealed that the disc in a CD player spins at between 200 and 500 revolutions per minute (RPM) depending upon which area of the disc is being read or played. (a) How many radians per second are equivalent to 200 RPM? (b) By pressing and holding the fast-forward button, the CD player could quickly increase its speed from 200 RPM to 448 RPM in just 0.75 seconds. What was the angular acceleration (α) of the CD in units of radians per secondsquared as it sped up from 200 to 448 RPM?
- A cyclist starts from rest and pedals such that the wheels of his bike have a constant angular acceleration.After 18 s, the wheels have made 76 rev. What is the angular velocity of the wheels after 18 s in rad/s ? What is the angular acceleration of the wheels in rad/s2 ?If the radius of the wheel is 32 cm, and the wheel rolls without slipping, how far has the cyclist (in m) traveled in 18 s?A basketball player spins the ball on his finger with an angular acceleration of 81 rad/s2 a. What is the ball's final angular velocity, in radians per second, if it starts from rest and the acceleration lasts 2.2s.The turntable of a record player has an angular velocity of 8.0 rad/s when it is turned off. Theturntable comes to rest 2.5 s after being turned off. Through how many radians does the turntablerotate after being turned off? Assume constant angular acceleration.